Water dam for a flush tank



FIG. 1 is a front perspective view of a water dam for a flush tank showing my new design;

FIG. 2 is a cross sectional view taken on line 2--2 of FIG. 1;

FIG. 3 is a rear perspective view thereof; and

FIG. 4 is a top plan view thereof with a portion omitted for convenience of illustration. 

The ornamental design for a water dam for a flush tank, as shown and described. 